Machine for stretching tanned skins and leathers



E. DURIO.

MACHINE FOR STRETCHING TANNED SKINS AND LEATHERS.

arrucmon FILED m. I0. I920.

1,367,023, Y j Patented Feb. 1,1921.

Zy Ma.

Application filed February 10, 1920. Serial ll'o. 387,534; 7

Tana whom it may cmwe'm:

:& it known that I Eaann'ro Dpmo, a subject-of the'King of ftaly, and resndentof Italy, have invented certain new and 5 usefiil' 1m rovements in 'Machines for 'j fstntching lanned Skins and Leathers, of which theiollowing-is a specification.

is known .that certain tanned skins and leathers of given classes must be subjected to operation before being put n .wimigioiu the 7' purpose of preventing their imthenelongation'when used, say, as drivbelts andthe like.

.obtainiilg satisfactory results it s l necessary that the stress exerted on theskm I not the same value on the whole .w'idth oftlie skin,but on the contrary the-walue'bf the. stretching stress must be proportional to the yieldingness (that is, to theliability to-be'elongated) of each'zone a: otlportionof the skin; as it is known, the character'of the skin as to yieldingnessis quite difierent in several zones of the skin, lower in the middle rtion of the skin and 'gher in the side an end ortions. J HThiS'iDVBIItiOD has for its 0 ject a ma chine .for stretching skins and leathers in Ihieh each. at the opposite edges of the stretched is grasped by a row of 80 mppers, the nippersof each row being adteto: and mdependent of each other; thor lippers of one of the rows are then mmaamyfrom those of the other row b an operative force, say a flu d pressure, at acts on all said nippers with the same So that the several portions of the ii, are. elongated to different extents on aoeountof thelr .difierent yieldingness.

i -Ellis invention comprises also particular instructions of the mppers as well as the i mounting in a resilient manner of the nip-- pe'rswhih are not operated by means adapted Zto produce .the stretching action.

The annexed drawing shows by way of example an embodiment ofthis invention and r1. 5 imtheisama Figure ,1 is a vertical section of thejnachine'on linear-w, Fig." 2, and Fig. Qisa lanview.-

has

own in the drawingr on plate onirame 1,-- which is supported b stands or 1165 2 are mounted two-rows o nippers 3 and- .3.- arranged side by side, each row beinga'located- ,n'ear-v one of; the ends of said Phte or frame 1:; 1- r I 66" szEt'hof' the anippers comprises two jaws pjfvoted atdr'tand having their tails 5 conerrornca.

mnn'ro DUBIO, or Team, ITALY- Specification of Letters Patent.

.ILGHINE FOB- STBE'I'OHING TANNED SKINS PatentedFeb. 1, 1921.

nectedwith a rod 6 by means of links 7 so that said aws act to grasp the material when a pu is exerted onrod 6. ,7

The mppers of one of the rows as 3 ma be stationary on the base plate or. frame but it is preferable to mount the same in aspring or resilient manner; 7

Such a mounting may be effected, in the embodiment shown on the drawing; means of a, bar 10 extendi'n across the p te 1 and through which the r0 ear the I nippers freely pass; on each rod6 is arranged a sprin 8 bearing-against said bar and a head 9a ustably mounted on the end of rod 6, so that the springs may be ad justed independently of each other.

Said bar 10 is connected by means of standards 19 passin through suitable slots 18 in plate 1, with a at 20 located under the 76 plate 1 and having nutsfenga' b screw-" threaded spindles 16 operat at t e same time and to the same extent by means'of pinions 17 meshing with each other. I Of course thegbar 10 ma be stationary on plate 1, the described device being omitted. The nippers 3' of therow located at the opposite end of the plate 1 are similarv to those above described and eachj'ofthem has its rod 6 connected with a, piston 6' sliding in a cylinder 11. 4 v Each cylinder is mounted on the base plate 1 so as to be free to swing around an axis perpendicular to plate 1 and to move along said late in a transversedirection; This mounting is obtained by means of a, journal or pivot 12 fixed to the cylinder and engaged in a slot 13 extending the en-' tire width of'the plate 1; said journal- 12 is conveniently provided with a threaded end rtion on which is located a nut 14enabl1n the cylinder "to be lar to the journals 12 above described.

.{The end of each cylinderin-front ofthe associated nippers 3' is connected withla' pipe'15jtowh1ch maybe fed a fluid under pressure.

The operation is as follows: The opposite" edges of theskin' or leather to'be stretched" underressure is, ed'to pipe 15; therefore the fluid pressure acts infirm-independent 250 grasping megnbe 10 i gee 61% mach ne y b p:

V r I g Y to leathers having difierent it :ee ls 'n m io i. of t Sk nsnnd "I nelltheirzenesomportions tothe ssnt n-m olihnesmyinveationkv v mgrowand cmneetedwith v nm ity oi cylinders 0ont and arranged a' row, g in cylinder, a plurality of ggms pl mans independent of each other eonneeted with one of said pistons,

comprising a trans, a lgrelity g ,the 'gr' means of each row being 18 8 onevf pp site edges of I. or leather, and menus for feed- In; a; pressure into said cylinder and c I w 1 for stretchingtanned skins an 1 thers comprising a frame, npluralit 40 of, gasping, members independent, of eac in a row and connected with e'phlrslity of cylinders arranged my, said eylindens w ll u e nd blbwing cylinders to siz ng and move finely a transverse a pi t nn eagch;

9 K W w s an- 91,1 i m o r nd I connected l 9 P t s, th means being ads to engege one of e r lBa hen-and flui under ressme t topimim edgesof t s din a V depgsaidfeel meets +j.

.mem we N dent ef we r ingr e with We a P wnkty of w nders-arran ed i'ow, in slot in said frame, means on said l e sw g a d mqvefieel'y a1 m i edr ga dc Wings plstpn m flyhlniar, a i

the ofvthe said feeding: means e e m g t ir -fur-- 'ent ofsmhethuand feeding means feeding means opening into all- Hndm's. i

y engaged eble spring means between :3: 9 sunshine em: skis:

limo pluralit w s a d, sl to allow said m mb grmdn ndent of:

each other and each connected with one of said istons, the rasping members of each new g seemed to engage one of the opposite edges of the skin or leather, and means for feeding a 'fluid'under pressure into said cylinders, said feeding means opening into a l'l said cylinders. 1 i 4. A machine .ior stretching tanned skins and leathers comprising a frame, a pluralit of cylinders connected with said frame a J arrangediin a row, a pisiml in each oph- 'der, optimality of members P i-dent f eaeh othu'end each 'mnmwtd' with one of'said .pistom, muns'fnr feeding a-fluid under-Wm ante and finders a in) cy r V a, y an nd pendent oi each otlmr and a row, and, adjmtnble mums ms Booting. eaeh *ef the last named mmbersbe ifwithhsaid m mem rs o eac row euzg mimefigf like opposite edges offlleskn or n53- A machine aim: #rdefizg a leathw a men nhty of cylinders mth' arrangedlmamapistonin a" a plurality of bars mm.

V mhmnneetad'mith 95 one of said pistons, mans for feedings:- fluid under pressure into said 'ndws, opening into said cylinders,,apl\1mlity of grasping members dependent of vetch nthudnd managed in a rgwiie lwart cometndwith said has, and 0 t e ast na ing mem Put-13* mg members.

each of the associated 165 the grasping members of each vnew hing adapted! geoneof time of the skin zlg leather. (g'limachine filmed shill an thersoompnsmg strum, a ping of cylinders Md with mid trains arranged in a m, a p ston in esohfil'ndun, a pluralit of memben qlundent of em: other and eanhmmdwith one of said piston, meam ior t flnid'under pressure intosaiidl this,

row, enrtmmmtndtn mono]: and fmglzo i the lest named g1; f mg snugly engaged wlthwput, fill-' umble spring between said put and each of V grasping members. and menu for shifting put aim frame, the grasping members at row being Idaptedtno gemeoithehpposm edges of the skin or leather. I A machine forstmtehinghlmedskim and leather; compr sing a frame, a plurality: 13,0

of grasping members independent of each other arranged in two rows at the sides of said frame, the grasping members of each row be' adapted to engage one of the op- 5 :%es 0 the skin or leather, a plu- 0 frame, a piston in each cylinder, each piston being connected with one of said grasping members for operating it, and means cylinders connected with said for feeding a fluid under pressure into said 10 cylinders to drive said pistons, said means openi into all said cylinders,

of said grasping members comprising jaws pivoted together and links connecting said aws with a rod fixed to the associated 15 piston.

Si ed atTu Ital Jan 9 1920. gn nmihn'ro h nfilo. 

